Merge "Remove the shadow under PendingAppWidgetHostView." into sc-dev am: 0a70a5a690 am: 9225d11671

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15328564

Change-Id: If1756603eea6aee76db66cadfebfa35f3fe2b0a5